A novel perovskite oxide chemically designed to show multiferroic phase boundary with room-temperature magnetoelectricity.
A novel perovskite oxide chemically designed to show multiferroic phase boundary with room-temperature magnetoelectricity.
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DOI：
10.1038/ncomms12772
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发表时间：
2016-09-28
影响因子：
16.6
通讯作者：
Amorin, Harvey
中科院分区：
文献类型：
--
作者：
Fernandez-Posada, Carmen M.;Castro, Alicia;Kiat, Jean-Michel;Porcher, Florence;Pena, Octavio;Alguero, Miguel;Amorin, Harvey
人们越来越积极地寻找新型单相多铁性材料，这些材料最终可以在室温下提供独特的磁电响应，因为它们将使一系列潜在的破坏性技术成为可能，利用磁场控制极化或电场控制磁性的能力（例如，电压可调自旋电子器件，非制冷磁传感器和长期搜索的磁电存储器）。一个非常有前途的新材料概念可能是利用多铁性态结构不稳定性的相变现象。事实上，大的相变磁电响应已被预期的钙钛矿BiFeO 3-BiCoO 3固溶体的第一原理研究，特别是在其morphotropic相边界之间的多铁性多晶型的菱形和四面体对称。在这里，我们报告了一种新的钙钛矿氧化物，属于BiFeO 3-BiMnO 3-PbTiO 3三元系统，化学设计，以呈现这样的多铁性相边界，增强铁电性和倾斜铁磁性，表现出独特的室温磁电响应。 在多铁性相界的结构变化预计有一个相关的大磁电响应，这还有待证明。在这里，Fernán-Posada等人报告了BiFeO 3-BiMnO 3-PbTiO 3固溶体的电场诱导相变，具有独特的磁性特征。
There is a growing activity in the search of novel single-phase multiferroics that could finally provide distinctive magnetoelectric responses at room temperature, for they would enable a range of potentially disruptive technologies, making use of the ability of controlling polarization with a magnetic field or magnetism with an electric one (for example, voltage-tunable spintronic devices, uncooled magnetic sensors and the long-searched magnetoelectric memory). A very promising novel material concept could be to make use of phase-change phenomena at structural instabilities of a multiferroic state. Indeed, large phase-change magnetoelectric response has been anticipated by a first-principles investigation of the perovskite BiFeO3–BiCoO3 solid solution, specifically at its morphotropic phase boundary between multiferroic polymorphs of rhombohedral and tetragonal symmetries. Here, we report a novel perovskite oxide that belongs to the BiFeO3–BiMnO3–PbTiO3 ternary system, chemically designed to present such multiferroic phase boundary with enhanced ferroelectricity and canted ferromagnetism, which shows distinctive room-temperature magnetoelectric responses. Structural change at multiferroic phase boundary is anticipated to have an associated large magnetoelectric response, which yet awaits to be evidenced. Here, Fernández-Posada et al. report electric field-induced phase change for a BiFeO3–BiMnO3–PbTiO3 solid solution with distinctive magnetic signature.
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